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Thread: Use jbutton to scroll through a jscrollpane

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    Question Use jbutton to scroll through a jscrollpane

    Howdy, I'm currently writing a java program which replicates a GPS, on the points of interest screen for Airports, Restaurants etc I have each entry set as a separate jbutton, organized using a gridlayout (1 column listing all entries) and finally the user is able to scroll through the entries (jscrollpanel). I have 2 arrow buttons for up/down and I want to use them to scroll through the list of entries. Is this possible?

    Cheers
    Josh


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    Default Re: Use jbutton to scroll through a jscrollpane

    So you have a row of JButtons you want to scroll through? What happens when you add them all to a JPanel, then add the JPanel to a JScrollPane?

    Recommended reading: How to Use Scroll Panes (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)
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    Default Re: Use jbutton to scroll through a jscrollpane

    Quote Originally Posted by KevinWorkman View Post
    So you have a row of JButtons you want to scroll through? What happens when you add them all to a JPanel, then add the JPanel to a JScrollPane?

    Recommended reading: How to Use Scroll Panes (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)
    Sorry, I didn't word my question very well. The jButtons have already been added to a jPanel, and the jPanel to the jScrollpane. I have two separate jButtons to the right of this jScrollpane which I want to use to scroll the jScrollpane up/down, is this possible?

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    Default Re: Use jbutton to scroll through a jscrollpane

    Get the appropriate JScrollBar of the JScrollPane, and set its value based upon its current value.
    In pseudo-code that can be implemented in a JButton action listener:
    myScrollPane.getVerticalScrollBar().setValue( myScrollPane.getVerticalScrollBar().getValue() + myScrollPane.getVerticalScrollBar().getUnitIncrement());

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    Default Re: Use jbutton to scroll through a jscrollpane

    Thanks, that helped heaps. I got it to work by doing this:

    JButton upButton = new JButton("Up");
    upButton.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent arg0){
    scrollPane.getVerticalScrollBar().setBlockIncrement(50);
     
    scrollPane.transferFocusDownCycle();
    scrollPane.getVerticalScrollBar().setValue( scrollPane.getVerticalScrollBar().getValue() - scrollPane.getVerticalScrollBar().getBlockIncrement());
     
    }
    });
     
    JButton downButton = new JButton("Down");
     
    downButton.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent arg0){
    scrollPane.getVerticalScrollBar().setBlockIncrement(50);
     
    scrollPane.transferFocusDownCycle();
    scrollPane.getVerticalScrollBar().setValue( scrollPane.getVerticalScrollBar().getValue() + scrollPane.getVerticalScrollBar().getBlockIncrement());
     
    }
    });

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